OK, this is genius how to teach children multiplication. Use your "hand calculator" to figure 8 and 9 multiplication tables. Where was this when I was in school? (Also, this is a crazy long video for such a simple concept.
Australian Curriculum Measurement & Geometry - - Estimate, measure & compare angles using degrees. Construct angles using a protractor. Marking the degrees that a door can open is a great visual for students learning about angles. (image only)